What must be done in order to solve for the unknown variable?

Solve for x -2.3(r - 1.2 ) = -9.66 enter you answer as decimal.

Abank manager wants to encourage new customers to open accounts with principals of at least $2,500. he decides to make a poster advertising a simple interest rate of 3%. what must the principal be if the bank manager also wants to advertise that one can earn $10 the first month? can the poster correctly say, "open an account of $2 comma 500 and earn at least $10 interest in 1 month! "?

Find the simplified product: 3e cube 9x to the fourth power times three cube 3x to the eighth